What is  refraction?

the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
  • change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.
  • measurement of the focusing characteristics of an eye or eyes (Murray et al., 1961).

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Murray, J., Bradley, H., Craigie, W. and Onions, C. (1961). The Oxford English dictionary. 1st ed. Oxford: Clarendon Press.


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